Pulse Generator with Analog Interpolation for Fine PWM Control
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Solution Overview
Problem
Existing buck regulators face challenges in providing precise voltage and current characteristics to microelectronic devices under rapidly changing power requirements, necessitating improved power regulation and pulse width modulation to enhance efficiency and accuracy.
Innovation Solution
A pulse generator system comprising a digital multiphase buck converter with a digital controller, analog-to-digital converter, delay locked loop circuit, and analog interpolators to generate fine pulse width modulation signals, ensuring accurate power delivery to microelectronic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional pulse width modulation is used in buck regulators, then the system is simpler to implement, but the voltage and current precision deteriorates under rapidly changing power requirements
Solution Approach 1:
The pulse width modulation is segmented into two stages: coarse PWM generation based on digital control signals, and fine PWM adjustment through analog interpolation. This segmentation allows the system to achieve high precision by combining digital robustness with analog granularity, resolving the contradiction between precision and complexity
Solution Approach 2:
The system dynamically adjusts the PWM signal by continuously interpolating between coarse digital pulses using analog circuits. This dynamic adjustment mechanism enables precise voltage and current control under rapidly changing power requirements while maintaining a manageable system architecture
2Manufacturing precision
If coarse pulse width modulation is used, then the device complexity is reduced, but the power regulation precision and ripple reduction deteriorates
Solution Approach 1:
An analog interpolator circuit is introduced as an intermediary between the digital coarse PWM generator and the final PWM output. This intermediary performs fine-grained analog interpolation to enhance regulation precision and reduce output ripple, while the overall system complexity remains controlled through modular architecture
3Measurement precision
If digital pulse code is directly converted to PWM signal, then the system complexity is minimized, but the pulse width precision and power delivery accuracy deteriorates
Solution Approach 1:
The signal processing is segmented into digital coarse encoding and analog fine adjustment stages. This segmentation enables high pulse width precision by combining the stability of digital pulse codes with the precision of analog interpolation, while keeping the signal processing circuit complexity manageable through functional decomposition
Data Source
AI summary
A pulse generator comprises a circuit configured to generate a coarse pulse width (CPW) signal, a first delay unit configured to generate a first delayed coarse pulse width signal, a delay locked loop circuit configured to generate a first subphase signal and a second subphase signal, a first analog interpolator, a second analog interpolator, and an amplifier having a first input connected to the first analog interpolator and a second input connected to the second analog interpolator and configured to generate a fine pulse width modulation signal.